I was actually thinking about a late model B-26C variant, as this was the glassed nose variant rather than either the B-26B or K variants. The reason was that I suggested this aircraft is that it is more versatile than the B version capable of being used for Photo Recon and limited cargo-carrying as well as stike mission.
A late model C version was armed with 2 x 0.5HMG in the nose as well as another three in each wing. Take out the lower turret and use the space to carry extra fuel and a navigation/bombing radar, as well control gear for AGM-12B 250lb Bullpup Missiles.
The reason I suggested the C141 was that it was primary used pre-war to move heavy project equipment around the US and the world. The aircraft could carry a maximum of 42 Tons. For those of you who can remember the TV series
UFO, think of the SHADO heavy lift aircraft carrying the SHADO ATV's around the world.
However, I still recomend the OV-10 s the main Project aircraft, it was as though it was designed especially for the Project. Please see the following link for further details:
OV-10 Bronco